JavaScript: Parse a HTTP Cookie header string and return an object of all cookie name-value pairs

JavaScript fundamental (ES6 Syntax): Exercise-171 with Solution

Write a JavaScript program to parse a HTTP Cookie header string and return an object of all cookie name-value pairs.

• Use String.prototype.split(';') to separate key-value pairs from each other.
• Use Array.prototype.map() and String.prototype.split('=') to separate keys from values in each pair.
• Use Array.prototype.reduce() and decodeURIComponent() to create an object with all key-value pairs.

Sample Solution:

JavaScript Code:

//#Source https://bit.ly/2neWfJ2 
const parseCookie = str =>
  str
    .split(';')
    .map(v => v.split('='))
    .reduce((acc, v) => {
      acc[decodeURIComponent(v[0].trim())] = decodeURIComponent(v[1].trim());
      return acc;
    }, {});
console.log(parseCookie('foo=bar; equation=E%3Dmc%5E2'));

Sample Output:

{"foo":"bar","equation":"E=mc^2"}

Pictorial Presentation:

Flowchart:

Live Demo:

See the Pen javascript-basic-exercise-171-1 by w3resource (@w3resource) on CodePen.

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